U.S. patent number 6,493,904 [Application Number 09/677,171] was granted by the patent office on 2002-12-17 for door closer.
This patent grant is currently assigned to Heng Kuo Co., Ltd.. Invention is credited to Chi-Tsao Chiang.
United States Patent |
6,493,904 |
Chiang |
December 17, 2002 |
Door closer
Abstract
A door closer includes casing fixedly fastened to a door frame,
a hydraulic cylinder installed in the casing and holding a
hydraulic fluid, a coupling block installed in one end of the
hydraulic cylinder, the coupling block having a pivot shaft
connected to a door, and a reciprocating mechanism coupled to the
coupling block, fluid velocity regulating valves installed in the
casing and controlled to adjust the velocity of the hydraulic fluid
flowing in the casing, the reciprocating mechanism including a
double-threaded adjustment rod for adjusting the spring power of
compression springs thereof.
Inventors: |
Chiang; Chi-Tsao (Tao-Yuan
Hsien, TW) |
Assignee: |
Heng Kuo Co., Ltd. (Taoyuan
Hsien, TW)
|
Family
ID: |
24717615 |
Appl.
No.: |
09/677,171 |
Filed: |
October 2, 2000 |
Current U.S.
Class: |
16/56; 16/57;
16/58 |
Current CPC
Class: |
E05F
3/104 (20130101); E05F 3/10 (20130101); E05F
3/12 (20130101); E05Y 2201/20 (20130101); E05Y
2201/254 (20130101); E05Y 2900/132 (20130101); E05F
3/227 (20130101); Y10T 16/2782 (20150115); Y10T
16/2777 (20150115); Y10T 16/2788 (20150115) |
Current International
Class: |
E05F
3/00 (20060101); E05F 3/10 (20060101); E05F
3/12 (20060101); E05F 003/04 () |
Field of
Search: |
;16/56,57,58,49,52,DIG.39,DIG.21,DIG.10 |
Primary Examiner: Knight; Anthony
Assistant Examiner: Williams; Mark
Claims
What the invention claimed is:
1. A door closer comprising: a casing, said casing comprising a
hydraulic cylinder holding a hydraulic fluid, two tunnels disposed
in communication with the hydraulic fluid in said hydraulic
cylinder, and two end cap means respectively fastened to said
tunnels at one end remote from said hydraulic cylinder; a coupling
block mounted in one end of said hydraulic cylinder, said coupling
block comprising a pivot shaft adapted for fastening to a door; and
a reciprocating mechanism coupled to said coupling block and to
move said pivot shaft in closing the door being fastened to said
pivot shaft, said reciprocating mechanism comprising two parallel
links respectively connected to said coupling block and disposed in
parallel to said casing, a baffle coupled to said links and
disposed adjacent to said coupling block, said baffle having two
through holes for the passing of said links, two pistons
respectively fastened to said links at one end remote from said
coupling block by a respective locating pin and reciprocated with
said links in said tunnels, two compression springs respectively
mounted on said links and stopped between said baffle and said
pistons, a screw bolt mounted on said baffle and stopped at one
side of said coupling block, an adjustment block threaded onto said
screw bolt and disposed at one side of said baffle opposite to said
coupling block, and an adjustment rod connected to said adjustment
block and disposed in parallel to said links for turning by the
user to move said adjustment block and said baffle along said
links, said adjustment rod having an outer end extended out of said
casing and spaced between said end cap means and an inner end
terminating in a double-threaded stem threaded into said adjustment
block.
2. The door closer of claim 1 wherein said casing further comprises
a plurality of mounting hole spaced between and disposed in
communication with said tunnels, and a plurality of fluid velocity
regulating valves respectively installed in said mounting holes and
secured in place by a respective washer.
3. The door closer of claim 2 wherein said adjustment rod comprises
a plurality of O-rings respectively disposed in contact with an
inside wall of said casing, said O-rings including a first O-ring
disposed adjacent to the outer end of said adjustment rod to stop
said hydraulic fluid from leaking out of said casing, and at least
one second O-ring respectively disposed between each two of said
mounting holes for enabling said fluid velocity regulating valves
to work independently.
4. The door closer of claim 1 further comprising stop means
fastened to said casing and adapted to stop said screw bolt from
touching said coupling block.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a door closer, and more
particularly to such a door closer, which comprises a
double-threaded adjustment rod controlled to regulate the spring
power of the compression springs of the reciprocating mechanism
thereof in adjusting the return speed of the door.
2. Description of the Prior Art
A regular door closer comprises an air cylinder fixedly fastened to
the doorframe, and a reciprocating rod moved in and out of the air
cylinder and fixedly connected to the door. This structure of door
closer is functional, however the air pressure of the air cylinder
is not adjustable. When installed, the user cannot adjust the
return speed of the door.
SUMMARY OF THE INVENTION
The invention has been accomplished to provide a door closer, which
eliminates the aforesaid drawback. According to one aspect of the
present invention, the door closer comprises a casing, the casing
comprising a hydraulic cylinder holding a hydraulic fluid, two
tunnels disposed in communication with the hydraulic fluid in the
hydraulic cylinder, and two end cap means respectively fastened to
the tunnels at one end remote from the hydraulic cylinder; a
coupling block mounted in one end of the hydraulic cylinder, the
coupling block comprising a pivot shaft adapted for fastening to a
door; and a reciprocating mechanism coupled to the coupling block
and to move the pivot shaft in closing the door being fastened to
the pivot shaft. According to another aspect of the present
invention, the casing further comprises a plurality of mounting
hole spaced between and disposed in communication with the tunnels,
and a plurality of fluid velocity regulating valve respectively
installed in the mounting holes and secured in place by a
respective washer. According to still another aspect of the present
invention, the adjustment rod comprises a plurality of O-rings
respectively disposed in contact with an inside wall of the casing,
the O-rings including a first O-ring disposed adjacent to the outer
end of the adjustment rod to stop the hydraulic fluid from leaking
out of the casing, and at least one second O-ring respectively
disposed between each two of the mounting holes for enabling the
fluid velocity regulating valves to work independently.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an exploded view of a door closer according to the
present invention.
FIG. 2 is a bottom view of the door closer according to the present
invention.
FIG. 3 is a sectional view taken along line A--A of FIG. 2.
FIG. 4 is a sectional view taken along line B--B of FIG. 2.
FIG. 5 is an enlarged view of a part of the present invention,
showing the positions of the O-rings on the adjustment rod relative
to the fluid velocity regulating valves.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to FIGS. 1 and 2, a door closer in accordance with the
present invention comprises a casing 10 fixedly mounted on the
doorframe 100 (see FIG. 4). The casing 10 comprises two tunnels 111
longitudinally extended to one end thereof and arranged in
parallel. A hydraulic cylinder 11 is fixedly mounted in the casing
10, and disposed in communication with the tunnels 111. The
hydraulic cylinder 11 holds a hydraulic fluid. Two screw caps 112
are respectively threaded into the tunnels 111 at one end to stop
the hydraulic fluid from leaking out of the tunnels 111. A coupling
block 20 is installed in one end of the hydraulic cylinder 11,
having a pivot shaft 21 perpendicularly protruded over one side
thereof and fastened to the door 200 (see FIG. 4). A reciprocating
mechanism 30 is pivoted to the coupling block 20, and controlled to
move the pivot shaft 21 in closing the door 200 on the doorframe
100.
The aforesaid reciprocating mechanism 30 comprises two parallel
links 31 respectively connected to the coupling block 20 and
disposed in parallel to the casing 10, a baffle 33 coupled to the
links 31 and disposed adjacent to the coupling block 20, the baffle
33 having two through holes 321 for the passing of the links 31,
two pistons 33 respectively fastened to the links 31 at one end
remote from the coupling block 20 by a respective locating pin 321
and reciprocated with the links 31 in the tunnels 111, two
compression springs 34 respectively mounted on the links 31 and
stopped between the baffle 32 and the pistons 33, a screw bolt 351
mounted on the baffle 32 and stopped at one side of the coupling
block 20, an adjustment block 35 threaded onto the screw bolt 351
and disposed at one side of the baffle 32 opposite to the coupling
block 20, and an adjustment rod 36 connected to the adjustment
block 35 and disposed in parallel to the links 31. The adjustment
rod 36 has an outer end extended out of the casing 10 and spaced
between the screw caps 112, and an inner end terminating in a
double-threaded stem 362 threaded into the adjustment block 35. By
means of rotating the adjustment rod 36 to move the adjustment
block 35 and the baffle 32 forwards or backwards on the links 31,
the compression springs 34 are compressed or released. The tunnels
111 have a particular cross section, for example, a circular cross
section. The pistons 33 fit the cross section of the tunnels 111.
The double thread design of the double-threaded stem 362 of the
adjustment rod 36 enables the adjustment block 35 to be moved fast
upon rotary motion of the adjustment rod 36. The outward movement
of the adjustment rod 36 is limited to a particular position, i.e.,
the adjustment rod 36 will be stopped by the screw caps 112 when
continuously turning the adjustment rod 36 outwards (see FIG.
3).
Referring to FIGS. 4 and 5, the casing 10 further comprises at
least one, for example, two mounting holes 12 spaced between and
disposed in communication with the tunnels 111, and two fluid
velocity regulating valves 40 respectively installed in the
mounting holes 12 and secured in place by a respective washer
41.
Referring to FIGS. 4 and 5 again, At least one, for example, two
O-rings 361 are mounted on the adjustment rod 36 to prevent a
leakage. One O-ring 361 is disposed adjacent to the outer end of
the adjustment rod 36, which protrudes outside the casing 10. The
other O-ring 361 is disposed between the mounting holes 12 (the
fluid velocity regulating valves 40) for enabling the fluid
velocity regulating valves 40 to work independently.
Referring to FIGS. 1 and 4 again, a stop member, for example, a
stop screw 14 is fastened to the casing 10 to stop the screw bolt
351 from touching the coupling block 20. If the screw bolt 351 is
forced into contact with the coupling block 20 during adjustment of
the adjustment rod 36, the coupling block 20 may be jammed and
unable to be moved with the links 31.
While only one embodiment of the present invention has been shown
and described, it will be understood that various modifications and
changes could be made thereunto without departing from the spirit
and scope of the invention disclosed.
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